There are thousands, perhaps millions of immigrants waiting in line, legally, to become U.S. citizens. Politicians agree that those who may be put on a path to legalization by immigration reform should wind up "behind" those already in line. What that means, though, is ill-defined. And if the line doesn't speed up, folks may die in line.

There are thousands, perhaps millions of immigrants waiting in line, legally, to become U.S. citizens. Politicians agree that those who may be put on a path to legalization by immigration reform should wind up "behind" those already in line. What that means, though, is ill-defined. And if the line doesn't speed up, folks may die in line.